Shimano ST-GRX-610-L left-hand shifter, double chainring, 12-speed

The Shimano GRX ST-RX610-L left-hand lever is a combined brake + gear lever (Dual Control Lever) designed for gravel and cyclocross: disciplines where precision, responsiveness and control are essential on varied and often rough terrain.

Integrated functions

Front derailleur control (2×): this controls the front derailleur to manage two chainrings, offering a wider gear range for climbing or accelerating on flat terrain.

Hydraulic brake: combined with a hydraulic disc brake system, the lever activates the brake with good modulation and power suited to off-road riding.

Unlike a simple lever dedicated solely to braking, this lever combines braking and gear shifting in a single unit for a more fluid and intuitive feel on descents or technical trails.

Ergonomics & feel

Designed for gravel riding: the grip shell and lever have been designed to offer a natural grip, even when wearing gloves or when the terrain becomes unstable.

Non-slip coating: textured surfaces on the grip and brake lever improve finger grip in critical conditions.

Reach adjustment: the distance between the lever and the grip can be adjusted, allowing you to tailor comfort to your hand size or riding style.

Key technical specifications

Left-hand (front) configuration: for operating the front derailleur and front brake.

2×12-speed compatibility: designed for Shimano GRX 12-speed groupsets with two front chainrings.

Handlebar mount: fits standard handlebar diameters (23.8–24.2 mm).

Shimano hydraulic system with mineral oil: reliable and easy to maintain, widely used on modern bikes.

Why is this lever worth considering?

It is a versatile and robust component, perfectly suited to long-distance rides or gravel tours where you alternate between stony paths, small roads and fast descents. The combination of hydraulic brakes and front gear control in a single unit improves both ergonomics and the rider’s responsiveness.